Modeling and Analysis of a Class-E Bidirectional Wireless Power Transfer System with Phase-Shift Control

This study presents the modeling and analysis of a bidirectional wireless power transfer system utilizing a ClassE inverter-rectifier topology. The system enables efficient ACDC and DC-AC energy conversion while achieving bidirectional energy flow through a phase-shift control strategy. The wireless energy transfer is based on electromagnetic induction principles, where the self-inductances of the transmitter and receiver coils, along with their mutual inductance (M), significantly influence the power transfer efficiency. The ClassE topology is employed to minimize switching losses and operate at high frequencies, enhancing overall system performance. A detailed MATLAB/Simulink model operating at 1 MHz is developed, and forward and reverse power flow modes are investigated by adjusting the phase difference between the inverter and rectifier switching signals. Simulation results demonstrate that as mutual inductance increases, the transferred power decreases while efficiency drops accordingly. The system achieves a maximum transfer efficiency of approximately 91% in forward mode and 95% in reverse mode. These findings highlight the potential of Class-E bidirectional converters for efficient, high-frequency wireless energy transfer applications, especially in dynamic environments such as electric vehicles and smart grids.